Improvement in sand-core boxes



`l5atented July 3,1877.

No.19Z,657.

NJPETERS. PHOTD LJTHOGRAFHE NrTED STATES JAMESV POWELL. OF CINCINNATI, OHIO.

IMPROVEMENTl IN V'SAND-CORE BOXES.

Specification forming part of Letters Patent No. 192,657, dated July 3, 1877 application filed `April 12, w77.

To all whom it may concern:

Be it known that I, JAMES POWELL, of Cincinnati, Hamilton county, Ohio, have invented certain new and useful Improvements in OorevBoxes, of which the following is a specification:

Theobject of my invention is to furnish a convenient box or mold in which cores for globe-val ves and cocks can be formedwith the greatest facility and in the most perfect and uniform manner. To accomplish these results I make use of a duplex drag, a duplex cope, and a removable diaphragm, which latter member ofthe box is preferably a single piece of metal or any other suitable-material, and is so shaped as to produce inthe finished core the necessary channels or passages into which the molten metal ows for the formation of the valve-seat and the walls that connect said seat to the lshell or globe of the cock. The duplex drag and duplex cope are formed by dividing both of these members vertically and in the axis of the globe, while the parting between-.said members is made obliquely, or inthe plane of the detachable inclined diaphragm. These live component members of thedevice are provided with suitable dowels and' socketsto facilitate the ready uniting of the box when the materi'altomake the-core is to be rammed therein, and at the same time to allow the convenient liberation of said core without causing any of its prints to lose their proper relative positions during such removal, as hereinafter more fully described.

In the-annexed drawings, Figure l is a perspective view, showing the duplex drag, the duplex cope, and the removable diaphragm coupled together. Fig. 2l is a perspective view of' the core-box after the vcope has been lifted from off'the diaphragm. Fig. 3' is a section ot the box in the plane'of the Vertical partings of the drag and cope, the diaphragm being shown in its normal positionV and the core-bar omitted. Fig. 4V is a similar section, but showingthe core-bar inserted in the box, and the latter rammed with the material composing the core proper. Fig. 5 is another section in the same plane, but showing the diaphragm removed and' the drag'and cope coupled together-so as to effect a junctionI between the two hal-ves ofthe core. .Figs Gand 7 are transverse sections of theemptycorebox, taken, respectively,at the lines 1 1- and 2 2. Fig. 8 is a perspective view of the diaphragm detached from the-box, and' Fig. "9is v aside elevation of the finished core, the end of one of its prints being brokenaway. Diagram l0 represents details ofthe preferred form of corebar. Y

The lower member or duplex ldragofthe box is composed of two castings, A land B, which are reverse fac-similes of each other,

and are, respectively, chambered out, as seen v at a b in Fig. 7. rIhis chambered portion of the drag is of the same diameter as the interior of the globe or shell thatis to be cast around the finished core. The rear ends of chambers a b commu-nicate, respectively, with a cylindrical bore, withinwhich is formed'one of the coreprints. This bore is composed of one semi-cylindrical portion, a', communi cating with chamber a, and of another semi'- cylindricall portion, b', that joins the chamber b. Projecting horizontally from-member Aoi' the drag are two or more dowel-pins, C C', capable ofengagement with appropriate sockets c c in the othermember, B', of saiddrag.

Furthermore, this member A isv provided with two vertical pins, VD D',complemented by two similar pins, E E', of the other half, B, ofthe drag, the duty of `which Vprojecting devices will presently appear. Theuppersurface or part of this duplex drag hasv its central portion inclined at F, which inclined part terminates withA two horizontal bearings, f f',

at opposite ends ofthe box.

The-duplex cope is essentially-an inverted fac-simile ofthe duplex drag, beingcomposed or' two castings, Gr andi H, chambered respectively at g h, which chambers communicate with the verticallyedivided cylindrical bore g h', within which bore the front core-printi's formed. In addition to't'his longi-tudinalbore g h theV chamber GV H communicates with a vertical'bore composedv of two semi-cylindrical cavities,vg h", as seen in Fig. 1.

Within thisvertical bore is formed the portion of the core that occupiesthe neck of the valve-or cock.

Projecting horizontallyV from Ymember G of the duplex cope are two or more pins, I igeapable of entering sockets z' 'i' of the opposite half of said cope.

Furthermore, these two members ofthe cope are'furnished, respectively, with vertical sockets or grooves J J K K', to receive the pins D D E E', just alluded to.

The part of this duplex cope corresponds with the part of the duplex dragthat is to say, the divided cope has an inclined surface, L, and two horizontal bearings, l l.

The diaphragm employed with my core-b0x consists, preferably, of a single plate or casting, whose inclined portion M has the same slope or angle as the part of the drag and cope. Said diaphragm is preferably furnished with two horizontal extensions, N 0, that rest .upon the dat bearings f f ofthe drag, as se en in Figs. 2 and 3. These extensions are perforated at n n and o o to admit the pins D E and D' E' of the divided drag.

Cast with this diaphragm is a horizontal circular partition, P, having at its center an aperture, p, through which the vertical mandrel S of the core-bar R S is passed. The front margin of this partition is united to the inclined plate M with a curved wall or molding-face, m, that has a slight outward flare toward its base or junction with said plate M. The rear margin of this partition is united to plate M by a similar but opposite molding-face,

m', that dares outwardly and upwardly to its junction with said plate. "The under side of this horizontal partition is counterbored at Q for a purpose that will presently appear. The core-bar, which is preferably used with this box, is constructed in the following manner:

R represents a bar, curved so as to clear the under side of partition P, and at the same time to occupy the axis of bore a b of the drag. The front end of this bar has an eye, r, into which is screwed the threaded stem s of an upwardly-tapering mandrel, Si, that is threaded at s for engagement of a nut or any other convenientdevice capable of retaining said mandrel in its proper axial position within the vertical bore g h of the duplex cope. This mandrel is iiattened at s", or otherwise arranged to prevent any twisting of the coreneck around said mandrel. The mandrel S is pierced at S to admit any implement wherewith said mandrel may be readily unscrewed from the bar R preparatory to removing said core-bar from the cast-cock or valve, it being understood that the sand or other substance composing the core has been previously knocked out of the cock in the usual manner. T is a collar on said mandrel.

The method of forming a core in this box is as follows: The two members A B of the divided drag are first coupled together by in-l serting the pins C U in their respective sockets c c', which act retains these two halves of the box in their proper positions until they are intentionally disengaged from each other. Gore-bar R S is then dropped into the now united drag, with the mandrel S presented upwardly, and rod R extending rearwardly, in the bore a. b.

Diaphragm M is then applied to the united drag, the pins D D' and E E being passed through the appropriate eyes n o and n' o', as seen in Fig. 2. In this condition of the box the mandrelS passes up through and about closes the aperture p of partition P, while the horizontal extensions N O rest upn the bearings fj" of the duplex drag, the inclined portion M of the diaphragm being supported on the sloping part F, as seen in Figs. 3 and 4.

The two halves G H of the cope are now coupled together by inserting pins I I in their appropriate sockets z' i', and this united cope is then superimposed upon the diaphragm M N O, the dowel-pins D D and E E' being engaged with the sockets J J and K K' of said cope. In this condition of the complete box the horizontal surfaces Z l of the united cope rest upon the flat faces N O of the diaphragm, while the part L of said cope is flush with the inclined plate M of said diaphragm.

A nutis then applied to the screw-threaded top s of the mandrel, and the collar T is drawn up snugly against the under side of partition P.

Drag A B is then rammed with any suitable core material by inserting such material through bore a. b', care being taken to preserve the bar R about in an axial position with reference to said bore. Cope G H is then rammed in the usual manner, and one or more wires are inserted in the bore g h', so as to unite the front and vertical prints of the core together. The position of these wires or nails is indicated with dotted lines U in Figs. 4 and 5.

The box having been rammed, the next proceeding is the removal of cope G H, which united member is readily lifted from oi' the pins D D and E E after the nut-has been disengaged from screw s', the tapering mandrel S slipping freely from the neck-print of the core. Diaphragm M N O is now removed, and the united cope is immediately applied to the united drag, so as to ei'ect a junction between the two previously-separated members of the core. When the cope and drag are thus coupled together the mandrel S continues to penetrate the neck-print of the core until the two halves of the latter are brought in close contact with each other. The mandrel thus acts as a wedge, and renders more rm and compact that portion of the core formed in the vertical bore g h of the cope.

The union of the cope and drag is but momentary, as the cope is almost immediately lifted off, the member A of the box disengaged from its companion B, and the finished core is at once placed in a suitable support preparatory to being baked in the customary manner.

The core is shown deatched from the box in Fig.'9, a reference to which illustration will show that said core is constructed with a spherical portion, V, that was formed in the combined chamber a b g h, which sphere is of the same diameter as the interior of the shell of the valve that is to be iinally cast around said core. Projecting from the spherical portion are two horizontal prints, v c', and a vertical one, c", the two former having been made in the bores g' h' and a' b' of the cope and drag respectively. The other print, o", was formed inthe vertical bore g" h" of the cope. It will also be seen that the sphere is divided obliquely by two channels, W W', which were formed by the molding-faces m m' of the diaphragm M, and when the baked core is placed in the ask and the molten metal poured into the mold, the metal will dow into these two channels W W', and thus form the inclined walls that unite the shell of the cock with the valve'seat.

Finally, it will be noticed the core is furnished with a contracted circular waist, X, that was formed in the counter-bore Q of partition P. q

This waist stops off the iow of metal from the two oblique channels W W', and thereby forms in the center of the shell a circular aperture; which, when properly finished, constitutes the valve-seat.

After the valve or cock has been cast around the core the latter is knocked to pieces, and mandrel S is then unscrewed from the threaded eye 1' of bar R. The now separated core-bar is at once removed from the cast cock or' valve, and is again applied to another mold or box, as previously described.

The sectional form of core-bar R S, herein described, is employed only with small valves or cocks, as the larger-sized valves aftord ample facility for the removal of a bar made in one piece. It is evident the diaphragm may be retained in its proper position by tongues and grooves instead of the pins and apertures, as herein described. Or, if preferred, the extensions' N O may be dispensed with, and the diaphragm may be seated in a recess formed in the inclined part of the drag, or of the drag and cope collectively.

But the arrangement of pins and perforated extensions is preferred, because they facilitate the handling of the box, and thus expedite the production of cores. Finally, the molding-faces m m' of the diaphragm may be arranged in any other way, provided they f'orm such channels in the core as will induce the molten metal to unite the valve-seat with the spherical walls or shell of the cock.

I claim as my inventionl. For globevalves and cocks, a core-box consisting of a duplex drag,a duplex cope, and a detachable inclined diaphragm, the part between said drag and cope being made in the plane of said diaphragm, substantially as herein described and set forth.

2. For globe-valves and cocks, a core-box consisting of a duplex drag, a duplex cope, and a detachable inclined diaphragm, the part between said drag and ,cope being made in the plane of said diaphragm, which latter member of the box is provided with two opposite molding-faces, m m', substantially as herein described and set forth.

3. For globe-valves and cocks, a core-box consisting of the duplex drag A a, a' C C' D D' B b b' c c' E E', duplex cope G gg' g" I I J J' H h h' h" i z" K K', and detachable diaphragm M m m N n n' O o o P p, substantially as herein described and set forth.

4. The within described diaphragm for coreboxes of globe-valves and cocks, consisting of plate M, having opposite moldingfaces 'm m', and perforated partition P p, said plate M being adapted to seat in the inclined parting of the box, substantially as herein described and set forth.

5. The within-described core for globevalves and cocks, consisting of a spherical portion, V, prints v 'u' fu", and two oblique channels, W W', that join the waist X, the two members of the core being anchored together by a bar embedded in the end printo' and the vertical print '/v", substantially as herein described and set forth.

In testimony of which invention I hereunto,

set my hand.

JAMES POWELL.

Witnesses:

JAMES H. LAYMAN, L. H. BOND. 

